JPH0557305A - Method and device for joining hot rolled stock - Google Patents

Abstract

PURPOSE:To provide a method and device for joining with which the allowance for joining of mutually joining rolled stocks which is necessary for continuous hot rolling can be reduced and with which joining time can be shortened. CONSTITUTION:Rolled stocks are held in a state that the rear end face 11a of preceding rolled stock 11 and tip end face 12a of the following rolled stock 12 for continuous hot rolling are brought into contact by pinch rolls 14, 15 and, by pressing the vicinities of those contact parts from the directions of two sides with a pressing mechanism 16 and inclined surfaces 17a, 17b of the dies 17, extended in the direction of contact surfaces. The preceding rolled stock 11 and following rolled stock 12 are tightly pressed and welded by contacting force due to this extension, the allowance for joining is reduced and joining is executed in a short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for joining rolled materials required for hot continuous rolling, and has a small joining margin and a short joining time.

[0002]

2. Description of the Related Art In recent years, in hot strip rolling as well as in the case of cold rolling, continuous rolling has been carried out in order to improve the yield and the rolling efficiency by reducing the defective portions at the front and rear ends. Is coming. In order to carry out such hot continuous rolling, it is necessary to join the preceding rolled material and the trailing rolled material before sending the rolled material rolled by the rough rolling mill to the finishing rolling mill. A method has been proposed.

As one of the methods for joining the rolled materials, for example, there is a technique disclosed in Japanese Patent Application Laid-Open No. 61-23502, and as shown in FIG. 4, the trailing end portion of the preceding rolled material 1 and the trailing rolled material 1 are joined. After forming a plurality of engaging concavo-convex portions 3 and 4 such as a dovetail groove and a dovetail at the tip of 2, the engaging concavo-convex portions 3 and 4 are pushed so as to overlap in the front and back directions, and are fitted together to mechanically. Are joined together and welded along the joint surface 5 to join them. Further, in the technique disclosed in Japanese Patent Laid-Open No. 59-130603, as shown in FIG. 5, the trailing end portion of the preceding rolled material 1 and the leading end portion of the trailing rolled material 2 are press-molded to reduce the thickness. Both ends of the thinned leading rolled material 1 and trailing rolled material 2 are abutted in the same plane, and the abutting surfaces 6 are welded and joined.

Further, in the technique disclosed in Japanese Patent Laid-Open No. 59-137106, as shown in FIG. 6, press forming is performed on the trailing end portion of the preceding rolled material 1 and the leading end portion of the trailing rolled material 2, respectively. The thickness is reduced in a complementary manner, the opposite ends of these complementary shapes are overlapped, and then the overlapped portions are pressure-welded to the original plate thickness and, at the same time, spot-welded with the electrode 7 to join them.

[0005]

However, in the joining method using the dovetail groove and the engaging concave and convex portions 3 and 4 of the dovetail and the like, it is necessary to machine the dovetail groove and the dovetail for mechanical connection. The portion where the dovetail groove and the dovetail are fitted is an off-gauge portion that cannot be manufactured into a product, so there is a problem that the joint margin is large. Further, in the method of welding the butt faces 6 by butting after reducing the thickness, the joining margin can be made small, but the welding takes time, and a long working distance is required for joining between the runs, and the welding is performed after stopping. In this case, there is a problem that the line stop time becomes long. Furthermore, after the thickness is reduced, they are overlapped to form the original rolled material 1, 2
In the method of pressing to the plate thickness and spot welding with the electrode 7 at the same time, the welding time can be shortened, but there is a problem that the joint margin due to the thinned overlapped portion is large.

The present invention has been made in view of the above-mentioned problems of the prior art, and is a hot-working method capable of joining the rolled materials required for hot continuous rolling with a small joining margin and joining in a short time. An object of the present invention is to provide a method and an apparatus for joining rolled materials.

[0007]

In order to solve the problems of the above-mentioned prior art, the method for joining hot-rolled material of the present invention joins the preceding rolled material and the trailing rolled material for hot continuous rolling. In this case, after bringing the trailing end surface of the preceding rolled material and the leading end surface of the trailing rolled material into contact, press the vicinity of the abutting portion of these preceding rolled material and trailing rolled material from the front and back direction It is characterized in that it is stretched and pressure-bonded.

The hot-rolled material joining apparatus of the present invention is an apparatus for joining a preceding rolled material and a trailing rolled material for hot continuous rolling. A rolling material contact mechanism for contacting the leading end surface, and inclined surfaces arranged on both sides in the front and back direction near the contacting portion of the trailing rolled material to impart elongation to the trailing rolled material in the contact direction It is characterized by comprising upper and lower dies and a press mechanism that drives these dies to apply a contact force due to elongation to the rear end surface of the preceding rolled material and the leading end surface of the trailing rolled material that are in contact with each other for crimping. To do.

Further, in the hot-rolled material joining apparatus of the present invention, in addition to the construction of the above-mentioned joining apparatus, the upper and lower molds are configured separately or integrally for the preceding rolled material and the following rolled material. It is a feature.

[0010]

According to this joining method for hot rolled material, the rear end surface of the preceding rolled material for continuous hot rolling and the leading end surface of the trailing rolled material are held in contact with each other, The vicinity of the abutting part between the rolled material and the trailing rolled material is pressed from the front and back directions so as to extend in the abutting end direction, respectively, and the abutting force due to this elongation causes the trailing end surface of the preceding rolled material and the trailing rolled material The press contact is made with the tip end surface of the, and the joining margin is made small by using the joint part as the contact surface between the rear end surface and the tip end face, and the force necessary for the press contact can be joined in a short time by utilizing the elongation by pressing. I am trying.

Further, according to this hot-rolled material joining apparatus, the hot-rolled material joining mechanism comprises a rolled material contact mechanism, a die, and a pressing mechanism.
The rolling material contact mechanism holds the trailing end surface of the preceding rolled material for hot continuous rolling in contact with the leading end surface of the trailing rolled material, and the die and press mechanism close the contact area to the front and back. The rolled material is stretched in the abutting end direction by pressing from the direction, and the trailing end surface of the preceding rolled material and the leading end surface of the trailing rolled material are pressed against each other by the abutting force due to this elongation.

Further, according to this hot-rolled material joining apparatus, in addition to the above-described structure, a die for pressing each of the rolled materials by pressing from the front and back directions to extend the respective rolled materials in the contact end direction is used for the preceding rolled material. The inclined surface and the inclined surface for the trailing rolled material are divided according to each other, or these two inclined surfaces are integrally configured,
The division makes it easier to evacuate the mold between runs, and makes it easier to manufacture by integrating.

[0013]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a process diagram according to an embodiment of a hot rolled material joining method of the present invention, and FIG. 2 is a side view along a line direction according to an embodiment of a hot rolled material joining apparatus of the present invention. is there. In this hot rolling material joining method and apparatus, joining of the preceding rolled material 11 and the following rolled material 12 is performed.
After the end faces are brought into contact with each other, the elongation generated by the press is used for pressure bonding.

Therefore, in the apparatus 10 for joining hot-rolled material, as shown in FIG.
And the front end surface 12a of the preceding rolled material 12 are brought into contact with each other, and pinch rolls 14 and 15 are provided upstream and downstream of the joining position A as a rolled material contact mechanism 13 for maintaining this state. The leading and trailing end faces 11 are formed by pressing the leading and trailing rolled materials 11 and 12 from the front and back.
The contact state of a and 12a can be maintained.

When the rolling material contact mechanism 13 is operated without stopping the rolling line, the rolling material contacting mechanism 13 is mounted on a traveling carriage or the like so that the rolling material can travel in synchronism with the line speed. Instead, when the preceding rolled material 11 is stopped and joined using a looper or the like, it is fixedly installed. Further, the rolled material contacting mechanism 13 includes the pinch rolls 14,
The structure is not limited to the case of 15, and any structure may be used as long as it can be brought into contact with another pressing member or the like to hold this state.

At the joining position A, the leading and trailing rolled materials 11 and 12 are pressed from the front and back directions to form the leading and trailing end faces 1.
A pressing mechanism 16 for causing elongation in the 1a and 12a directions is arranged, and a pair of upper and lower molds 17 is mounted on the pressing mechanism 16. As shown in FIG. 2, the pair of upper and lower molds 17 has an inclined surface 17a formed by pressing the rear end portion of the preceding rolled material 11 from the front and back directions and extending it backward and the tip end of the trailing rolled material 12. The inclined surface 17b is formed by pressing the portion from the front and back sides and extending it forward. The inclined surface 17b is formed on both sides of the joining position A and is connected to each other in a substantially V shape with a space therebetween. Parallel part 1 in succession
The inclined surfaces 17d and 17e opposite to 7c are formed to constitute one mold 17.

As shown in FIG. 3, the metal mold to be mounted on the pressing mechanism 16 is a pair of upper and lower parts which are formed by pressing the rear end portion of the preceding rolled material 11 from the front and back directions and extending it backward. A die 18 and a top and bottom 1 formed by pressing the front end of the trailing rolled material 12 from the front and back sides to extend it forward.
It can also be configured by being divided into a pair of molds 19. Therefore, the mold 18 is formed with the sloped surface 17a, the parallel portion 17c, and the sloped surface 17d of the mold 17 described above, which correspond to the sloped surface 18a, the parallel portion 18c, and the sloped surface 18d, respectively. Is formed by forming an inclined surface 19b, a parallel portion 17c, and an inclined surface 19e respectively corresponding to the inclined surface 17b, the parallel portion 17c, and the inclined surface 17e of the mold 17 already described. The press mechanism 16 is also composed of two sets corresponding to the molds 18 and 19.

Next, the operation of the hot-rolled material joining apparatus 10 thus configured and the method for joining the hot-rolled material will be described with reference to the process diagram shown in FIG. (1) In this joining step, first, as shown in FIG. 1A, the trailing end surface 11a of the preceding rolled material 11 and the trailing rolled material 1 are
The pinch rolls 14 and 15 of the rolled material abutting mechanism 13 abut the tip end surface 12a of the second member 2 at the joining position A, and the abutting state is maintained. Prior to this abutment, the trailing end portion of the preceding rolled material 11 and the leading end portion of the trailing rolled material 12 that form the joining surface are cut by a cutting device to adjust the shapes of the trailing end surface 11a and the leading end surface 12a, Etc. are dropped and treated cleanly to the extent that they can be crimped.

(2) After the trailing end surface 11a of the preceding rolled material 11 and the leading end surface 12a of the trailing rolled material 12 are held in contact with each other in this manner, as shown in FIG.
The pair of upper and lower molds 17 mounted on the upper and lower surfaces of the preceding rolled material 11 and the succeeding rolled material 12 are pressed from the front and back sides in the vicinity of the contact portion (joining position A). Then, the rear end portion of the preceding rolled material 11 is extended backward by the two inclined surfaces 17a and 17b arranged in the V-shape of the die 17, and the leading end portion of the trailing rolled material is moved forward. It will be stretched and the preceding rolled material 1
The pressing force is applied to the contact surfaces of the rear end surface 11a of the first rolling member 12 and the front end surface 12a of the trailing rolled material 12 so as to press them against each other, whereby the leading rolled material 11 and the trailing rolled material 12 are joined. When the preceding rolled material 11 and the following rolled material 12 are not at the temperature required for pressure bonding, a separate heating device may be installed for heating.

A concave portion is formed by the die 17 on the preceding rolled material 11 and the following rolled material 12 thus joined,
The depth is set so that it is pressed in a range smaller than the thickness of the plate of the final rolled product, and the recess gradually disappears in the subsequent rolling process, and the product is not affected at all. The trailing end surface 11a of the preceding rolled material 11 and the trailing rolled material 1
Since the second tip surface 12a is used as a joint surface, almost no joint margin is required, and since the crimping force is obtained by utilizing the elongation by the press, the joint can be completed in a very short time. Further, as the die for obtaining the crimping force by utilizing the elongation by the press, the die 17 and the die 18 having the divided structure shown in FIG. It can be joined in a very short time without the need.

Further, the joining of these rolled materials can be carried out by mounting the device on a traveling carriage or the like which is driven in synchronization with the line speed while the preceding and following rolled materials are traveling, or by connecting the looper and accumulator. For example, it is possible to appropriately select, for example, to join the preceding rolled material in a stopped state. Further, it goes without saying that the constituent elements may be modified within the scope of the invention.

[0022]

As described above in detail with reference to the embodiments, according to the hot-rolled material joining method of the present invention, the trailing end surface of the preceding rolled material for hot continuous rolling and the leading end of the trailing rolled material are used. The surfaces are kept in contact with each other, and the vicinity of the abutting part between the preceding rolled material and the following rolled material is pressed from the front and back directions to give respective elongations in the abutting end direction. Since the rear end surface of the preceding rolled material and the leading end surface of the trailing rolled material are pressed against each other, it is possible to reduce the joining margin by using the joint portion as the contact surface between the trailing end surface and the leading end surface. Since the necessary force is obtained by the press, it is possible to join in a very short time.

Further, according to this hot-rolled material joining apparatus, the hot-rolled material joining mechanism comprises a rolled material contact mechanism, a die, and a press mechanism,
The rolling material contact mechanism holds the trailing end surface of the preceding rolled material for hot continuous rolling in contact with the leading end surface of the trailing rolled material, and the die and press mechanism close the contact area to the front and back. From each direction to give an elongation to each rolled material in the abutting end direction, and the abutting force due to this elongation presses the rear end surface of the preceding rolled material and the leading end surface of the following rolled material. No cost is required and the joining can be done in a very short time.

Further, according to this hot-rolled material joining apparatus, in addition to the above-mentioned structure, a die for pressing each of the rolled materials by pressing from the front and back directions to extend the respective rolled materials in the abutting end direction is used for the preceding rolled material. The inclined surface and the inclined surface for the trailing rolled material are divided according to each other, or these two inclined surfaces are integrally formed. By dividing the inclined surface, the mold is withdrawn during joining between the runs. Can be made easier, and by making them integrated, the manufacture can be facilitated and the necessary press mechanism can be reduced.

[Brief description of drawings]

FIG. 1 is a process chart according to an embodiment of a method for joining hot-rolled materials according to the present invention.

FIG. 2 is a side view taken along the line direction according to the embodiment of the hot-rolled material joining apparatus of the present invention.

FIG. 3 is a side view of a die part according to another embodiment of the hot-rolled material joining apparatus of the present invention.

FIG. 4 is a process explanatory view of a conventional method for joining rolled materials.

FIG. 5 is a process explanatory view of a conventional method for joining rolled materials.

FIG. 6 is a process explanatory view of a conventional method for joining rolled materials.

[Explanation of symbols]

 10 Joining device for hot rolled material 11 Pre-rolled material 11b Rear end surface 12 Trailing rolled material 12b Its leading end surface 13 Rolled material contact mechanism 14,15 Pinch roll 16 Press mechanism 17 Mold (integrated type) 17a, 17b Inclined surface 18, 19 Mold (divided type) 18a, 19b Inclined surface A Joining position

Claims (3)

[Claims] 1. When joining a preceding rolled material and a trailing rolled material for hot continuous rolling, after abutting the trailing end surface of the preceding rolled material and the leading end surface of the trailing rolled material, these preceding rolling materials A method for joining hot-rolled material, characterized in that the vicinity of the contact portion between the material and the subsequent rolled material is pressed from the front and back directions to impart elongation in the contact direction and to perform pressure bonding. 2. A rolling material contact mechanism for contacting a trailing end surface of a preceding rolling material and a leading end surface of a following rolling material in a device for joining a preceding rolling material and a trailing rolling material for hot continuous rolling. When,
Upper and lower molds provided with inclined surfaces that are arranged on both sides in the front and back direction near the contact portion of the trailing rolled material and that impart elongation to the trailing rolled material in the contact direction, and contact by driving these molds. A joining device for a hot rolled material, comprising: a press mechanism that presses the trailing end surface of the preceding rolled material in a state and the leading end surface of the trailing rolled material by applying an abutting force due to elongation to crimp. 3. The heat according to claim 2, wherein the upper and lower molds are separately configured for the preceding rolled material and the trailing rolled material, or integrally formed by having these two inclined surfaces. Bonding device for hot rolled material.